The correct answer would be, Diffusion of Responsibility.
Burt has cited the explanation of Diffusion of Responsibility for the bystander effect.
Explanation:
Diffusion of Responsibility is a concept in sociopsychology. In this phenomenon a person does not take responsibility of his or her own deeds, especially when others are present in the current situation.
In this form of attribution, the people think that others are responsible for the thing that happened or the circumstances or environment is responsible for the happening. This tendency is called as the Diffusion of Responsibility.
So when Burt told the police officer that he didn't do anything and kept quiet because he thought the someone else will help the victim of mugging, he is citing the effect of Diffusion of Responsibility.
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